Battery charge time calculator

This calculator is designed to calculate the maximum battery charge time for any given chargable batter. The calculator will calculate the time after you enter the battery rating capacity, charge rate and the efficiency of the charging system, including the battery. The normally accepted standard for efficiency loss is 20%-30%.

Sample values for a car is 60ah and 0.8A for with the Optimate 4 charger
Sample values for a Motorbike is 20ah and 0.6A for with the Optimate 3+ charger

Battery charge time calculator


This is the time taken to recharge an absolutely flat battery
Battery capacity Amp hour (Ah)
Charge rate Amp (A)
Between and hours.

Calculation based on a 70-80% charging Inefficiency


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